Patent Number: 6,254,212

Title: Method and device for determining the quantity of product present in a reservoir, notably that of ink present in an image forming device

Abstract: A device determines a quantity of product present in a reservoir, particularly a quantity of ink in the reservoir (112) of an image forming device, such as a printer (10). The device includes an electrode (120) disposed in contact with the product in the reservoir, a circuit (117) for supplying the electrode with an excitation signal (SE) causing an electromagnetic signal radiated by the product, a receiving antenna (116) for sensing the electromagnetic signal, and a circuit (115) for processing the electromagnetic signal sensed into a signal representing the quantity of product present in the reservoir.

Inventors: Coudray; Pascal (La Chapelle des Fougeretz, FR), Froger; Marie-Helene (Chateaugiron, FR), Truffaut; Christophe (Rennes, FR)

Assignee: Canon Kabushiki Kaisha

International Classification: B41J 2/175 (20060101); G01F 23/284 (20060101); G01F 23/26 (20060101); G01F 23/22 (20060101); B41J 002/195 ()

Expiration Date: 07/03/2018